How Can I Stop My Character From Stuttering Due To Tween?

I have a tween script that tweens your torso to your mouse's position in first person. When I move around, and THEN move the mouse, my character stutters and slows down. Here's my code. I need help so the character DOESN'T stutter. I don't want any major changes or anything. CODE STARTS AND ENDS AT 3 BRACKETS. IGNORE CODE SNIPPETS. [[[-- Variables for services local render = game:GetService("RunService").RenderStepped local contextActionService = game:GetService("ContextActionService") local TweenService = game:GetService('TweenService') local userInputService = game:GetService("UserInputService")

local player = game.Players.LocalPlayer local mouse = player:GetMouse() -- local Tool = script.Parent

-- Variables for Module Scripts local screenSpace = require(script:WaitForChild("ScreenSpace"))

local connection -- Variables for character joints

local neck, shoulder, oldNeckC0, oldShoulderC0

local mobileShouldTrack = true

-- Thourough check to see if a character is sitting local function amISitting(character) local t = character.Torso for _, part in pairs(t:GetConnectedParts(true)) do if part:IsA("Seat") or part:IsA("VehicleSeat") then return true end end end

-- Function to call on renderstepped. Orients the character so it is facing towards -- the player mouse's position in world space. If character is sitting then the torso -- should not track local function frame(mousePosition) -- Special mobile consideration. We don't want to track if the user was touching a ui -- element such as the movement controls. Just return out of function if so to make sure -- character doesn't track if not mobileShouldTrack then return end

-- Make sure character isn't swiming. If the character is swimming the following code will
-- not work well; the character will not swim correctly. Besides, who shoots underwater?
if player.Character.Humanoid:GetState() ~= Enum.HumanoidStateType.Swimming then
	local torso = player.Character.Torso
	local head = player.Character.Head
	
	local toMouse = (mousePosition - head.Position).unit
	local angle = math.acos(toMouse:Dot(Vector3.new(0,1,0)))
	
	local neckAngle = angle

	-- Limit how much the head can tilt down. Too far and the head looks unnatural
	--[[if math.deg(neckAngle) > 110 then
		neckAngle = math.rad(110)
	end
	neck.C0 = CFrame.new(0,1,0) * CFrame.Angles(math.pi - neckAngle,math.pi,0)]]
	
	-- Calculate horizontal rotation
	local arm = player.Character:FindFirstChild("Right Arm")
	local fromArmPos = torso.Position + torso.CFrame:vectorToWorldSpace(Vector3.new(
		torso.Size.X/2 + arm.Size.X/2, torso.Size.Y/2 - arm.Size.Z/2, 0))
	local toMouseArm = ((mousePosition - fromArmPos) * Vector3.new(1,0,1)).unit
	local look = (torso.CFrame.lookVector * Vector3.new(1,0,1)).unit
	local lateralAngle = math.acos(toMouseArm:Dot(look))		
	
	-- Check for rogue math
	if tostring(lateralAngle) == "-1.#IND" then
		lateralAngle = 0
	end		
	
	-- Handle case where character is sitting down
	if player.Character.Humanoid:GetState() == Enum.HumanoidStateType.Seated then			
		
		local cross = torso.CFrame.lookVector:Cross(toMouseArm)
		if lateralAngle > math.pi/2 then
			lateralAngle = math.pi/2
		end
		if cross.Y < 0 then
			lateralAngle = -lateralAngle
		end
	end	
	
	-- Turn shoulder to point to mouse
	--[[shoulder.C0 = CFrame.new(1,0.5,0) * CFrame.Angles(math.pi/2 - angle,math.pi/2 + lateralAngle,0)]]	
	
	-- If not sitting then aim torso laterally towards mouse
	if not amISitting(player.Character) then
		local tweenInfo = TweenInfo.new(0.6, Enum.EasingStyle.Quad, Enum.EasingDirection.Out, 0, false, 0)
		local tween = TweenService:Create(player.Character.HumanoidRootPart, tweenInfo, {["CFrame"] = CFrame.new(torso.Position, torso.Position + (Vector3.new(mousePosition.X, torso.Position.Y, mousePosition.Z)-torso.Position).unit)})
		tween:Play()
		
		--torso.CFrame = CFrame.new(torso.Position, torso.Position + (Vector3.new(mousePosition.X, torso.Position.Y, mousePosition.Z)-torso.Position).unit)
	else
		--print("sitting")		
	end	
end

end

-- Function to bind to render stepped if player is on PC local function pcFrame() frame(mouse.Hit.p) end

-- Function to bind to touch moved if player is on mobile local function mobileFrame(touch, processed) -- Check to see if the touch was on a UI element. If so, we don't want to update anything if not processed then -- Calculate touch position in world space. Uses Stravant's ScreenSpace Module script -- to create a ray from the camera. local test = screenSpace.ScreenToWorld(touch.Position.X, touch.Position.Y, 1) local nearPos = game.Workspace.CurrentCamera.CoordinateFrame:vectorToWorldSpace(screenSpace.ScreenToWorld(touch.Position.X, touch.Position.Y, 1)) nearPos = game.Workspace.CurrentCamera.CoordinateFrame.p - nearPos local farPos = screenSpace.ScreenToWorld(touch.Position.X, touch.Position.Y,50) farPos = game.Workspace.CurrentCamera.CoordinateFrame:vectorToWorldSpace(farPos) * -1 if farPos.magnitude > 900 then farPos = farPos.unit * 900 end local ray = Ray.new(nearPos, farPos) local part, pos = game.Workspace:FindPartOnRay(ray, player.Character)

	-- if a position was found on the ray then update the character's rotation
	if pos then
		frame(pos)
	end
end

end

local oldIcon = nil -- Function to bind to equip event local function equip() local torso = player.Character.Torso

-- Setup joint variables
neck = torso.Neck	
oldNeckC0 = neck.C0
shoulder = torso:FindFirstChild("Right Shoulder")
oldShoulderC0 = shoulder.C0

-- Remember old mouse icon and update current
--[[oldIcon = mouse.Icon
mouse.Icon = "http://www.roblox.com/asset/?id=79658449"]]

-- Bind TouchMoved event if on mobile. Otherwise connect to renderstepped
--[[if userInputService.TouchEnabled then
	connection = userInputService.TouchMoved:connect(mobileFrame)
else
	connection = render:connect(pcFrame)
end]]
while wait() do
	pcFrame()
end

-- Bind TouchStarted and TouchEnded. Used to determine if character should rotate
-- during touch input
userInputService.TouchStarted:connect(function(touch, processed)
	mobileShouldTrack = not processed
end)	
userInputService.TouchEnded:connect(function(touch, processed)
	mobileShouldTrack = false
end)

--[[-- Fire server's equip event
game.ReplicatedStorage.ROBLOX_PistolEquipEvent:FireServer()

-- Bind event for when mouse is clicked to fire server's fire event
mouse.Button1Down:connect(function()
	game.ReplicatedStorage.ROBLOX_PistolFireEvent:FireServer(mouse.Hit.p)
end)

-- Bind reload event to mobile button and r key
contextActionService:BindActionToInputTypes("Reload", function() 
	game.ReplicatedStorage.ROBLOX_PistolReloadEvent:FireServer()		
end, true, "r")

-- If game uses filtering enabled then need to update server while tool is
-- held by character.
if workspace.FilteringEnabled then
	while connection do
		wait()
		game.ReplicatedStorage.ROBLOX_PistolUpdateEvent:FireServer(neck.C0, shoulder.C0)
	end
end]]

end

-- Function to bind to Unequip event --[[local function unequip() if connection then connection:disconnect() end contextActionService:UnbindAction("Reload") game.ReplicatedStorage.ROBLOX_PistolUnequipEvent:FireServer() mouse.Icon = oldIcon neck.C0 = oldNeckC0 shoulder.C0 = oldShoulderC0 end]]

equip()]]] Most of the stuff is commented out.